conf: add config_dup_block_path()

src/conf.c

@@ -606,6 +606,26 @@ config_get_block_string(const struct config_param *param, const char *name,
 	return bp->value;
 }
 
+char *
+config_dup_block_path(const struct config_param *param, const char *name,
+		      GError **error_r)
+{
+	assert(error_r != NULL);
+	assert(*error_r == NULL);
+
+	const struct block_param *bp = config_get_block_param(param, name);
+	if (bp == NULL)
+		return NULL;
+
+	char *path = parsePath(bp->value, error_r);
+	if (G_UNLIKELY(path == NULL))
+		g_prefix_error(error_r,
+			       "Invalid path in \"%s\" at line %i: ",
+			       name, bp->line);
+
+	return path;
+}
+
 unsigned
 config_get_block_unsigned(const struct config_param *param, const char *name,
 			  unsigned default_value)

src/conf.h

@@ -194,6 +194,15 @@ config_dup_block_string(const struct config_param *param, const char *name,
 	return g_strdup(config_get_block_string(param, name, default_value));
 }
 
+/**
+ * Same as config_dup_path(), but looks up the setting in the
+ * specified block.
+ */
+G_GNUC_MALLOC
+char *
+config_dup_block_path(const struct config_param *param, const char *name,
+		      GError **error_r);
+
 G_GNUC_PURE
 unsigned
 config_get_block_unsigned(const struct config_param *param, const char *name,

src/output/fifo_output_plugin.c

@@ -178,30 +178,25 @@ fifo_open(struct fifo_data *fd, GError **error)
 static void *
 fifo_output_init(G_GNUC_UNUSED const struct audio_format *audio_format,
 		 const struct config_param *param,
-		 GError **error)
+		 GError **error_r)
 {
 	struct fifo_data *fd;
-	char *value, *path;
 
-	value = config_dup_block_string(param, "path", NULL);
+	GError *error = NULL;
-	if (value == NULL) {
+	char *path = config_dup_block_path(param, "path", &error);
-		g_set_error(error, fifo_output_quark(), errno,
-			    "No \"path\" parameter specified");
-		return NULL;
-	}
-
-	path = parsePath(value, error);
-	g_free(value);
 	if (!path) {
-		g_prefix_error(error, "Invalid path in line %i: ",
+		if (error != NULL)
-			       param->line);
+			g_propagate_error(error_r, error);
+		else
+			g_set_error(error_r, fifo_output_quark(), 0,
+				    "No \"path\" parameter specified");
 		return NULL;
 	}
 
 	fd = fifo_data_new();
 	fd->path = path;
 
-	if (!fifo_open(fd, error)) {
+	if (!fifo_open(fd, error_r)) {
 		fifo_data_free(fd);
 		return NULL;
 	}